OpenGL scale texture coordinates

[Alex M]

Hi
I use opengl shader for apply median filter to image. Input image I copy to in_fbo buffer. All work fine.

	QGLFramebufferObject *in_fbo, *out_fbo;
    out_fbo->bind();
	glViewport( 0, 0, nWidth, nHeight );
	glMatrixMode( GL_PROJECTION );
	glLoadIdentity();

	glOrtho( 0.0, nWidth, 0.0, nHeight, -1.0, 1.0 );

	glMatrixMode( GL_MODELVIEW );
	glLoadIdentity( );

	glEnable( GL_TEXTURE_2D );

	out_fbo->drawTexture( QPointF(0.0,0.0), in_fbo->texture( ), GL_TEXTURE_2D );

But in shader code I need divide position of vertex by width and height of image, because texture coordinates are normalized to a range between 0 and 1.

vec2 texCoord = vec2( pos.x / float( imgWidth ), pos.y / float( imgHeight ) );

How I can scale texture coordinates? I want have texture coordinates in range between 0 and imgWidth, It is important for me.